your mother may be competing for lack of a better word with your possible mates for your attention etc unconsciously of course it might be difficult for a mother to grasp that youll ever love another woman as much or even more as her on the other hand my ma is utterly disgusted with me for crushing on any girl at all if im ever mopey about a girl she wont hesitate to tell me to suck it up or call me a faggot in the most loving way possible lol